embryonic stem cells into becoming beating heart cells in a petri dish using growth factor that's mimic the environment in the womb. >> my weekends would hinge on whether there were beating cells or not. >> once there were enough of the beating cells they began watching them as they grew and developed extracting their dna and cataloging changes. a process made possible only yeentsly by development of powerful new gene sequencing technology. >> human genome announced to great fanfare cost $3 billion to sequence one individual dna. now we can do the same person's dna in a week for $3,000. >> still, it took massive networks of computers to organize the data into a genetic blueprint detailing creation of a heart cell. >> this mind conjure up images of growing hearts, immediate impact likely would be repairing them or perhaps heading off birth defects in babies before they're born. >> this is part of the attraction to understanding this blueprint is that this is very amenable to drug-type intervention. >> the team now hopes to study dna of patients born with congenital heart disease. and possibly identify t